Systematic Optical Orthogonal Code Design Techniques Using Extended Sets

Optical orthogonal code (OOC) sequences are assigned to optical code-division multiple-access (CDMA) network users, who are then able to transmit data asynchronously through this network. In this work, we present two systematic OOC design techniques based on extended sets. The first technique is a deterministic design approach where the OOC sequences are generated in a single run. We demonstrate that with this design strategy, although not optimal, sequences of relatively short length can be obtained and hence, the required system bandwidth can be feasible for asynchronous intensity-modulation/direct-detection (IM/DD) optical CDMA systems. The second design technique is semi-random and may require multiple iterations until all OOC sequences are generated. Although computationally more cumbersome, this design method is able to converge to the optimal OOC and hence, enables minimum required system bandwidth for the optical CDMA system under consideration.